Multi-directional vibration actuator

ABSTRACT

The present disclosure provides a vibration device, including a stator, an eccentric wheel and an electromagnetic driving assembly. The eccentric wheel rotates around a rotating shaft relative to the stator. The electromagnetic driving assembly includes at least one magnetic element and an induction coil. The at least one magnetic element is disposed on the eccentric wheel. The induction coil corresponds to the magnetic element, and the induction coil is disposed on the stator. When a current is applied to the induction coil, the induction coil acts with the magnetic element to generate an electromagnetic force to drive the eccentric wheel to rotate around the rotating shaft, so that the vibration device generates a vibration. The rotating shaft is disposed on the stator.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.62/431,556 filed on Dec. 8, 2016, and China Patent Application No.201711079442.X, filed Nov. 6, 2017, the entirety of which areincorporated by reference herein.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

The present disclosure relates to a vibration device, and moreparticularly to a vibration device utilizing sensing coils and magnetsto generate an electromagnetic force to generate vibration.

Description of the Related Art

As technology has progressed, many kinds of electronic devices, such astablet computers and smartphones, have been produced to include avibration notification function. When performing a specific function,such an electronic device can vibrate, through the use of a built-invibration device, in order to notify a user. For example, when theelectronic device receives a message or the user presses a button on theelectronic device, the electronic device can vibrate to notify the userthat the message has been received or that the button has been pressedsuccessfully.

A current vibration module that is widely used utilizes a rotary motorto drive an eccentric member to generate the vibration. However, therotary motor is a conventional DC brush motor, and the thickness of thevibration module with the DC brush motor cannot be decreased anyfurther. In addition, the eccentric member is disposed outside of therotary motor and connected to a rotating shaft of the rotary motor,which means that the length of the vibration module cannot be decreasedany further. As a result, the size of the vibration module cannot bereduced any further. Furthermore, the vibration module composed of therotary motor and the eccentric member can only provide a vibration in asingle direction or on a plane.

Therefore, how to design a vibration device capable of providing atleast two vibration directions or achieving miniaturization is animportant subject for further research and development.

BRIEF SUMMARY OF THE DISCLOSURE

Accordingly, one objective of the present disclosure is to provide avibration device utilizing electromagnetic force, so as to solve theproblems described above.

According to some embodiments of the disclosure, a vibration device isprovided, and the vibration device includes a stator, an eccentric wheeland an electromagnetic driving assembly. The eccentric wheel rotatesaround a rotating shaft relative to the stator. The electromagneticdriving assembly includes at least one magnetic element and an inductioncoil. The at least one magnetic element is disposed on the eccentricwheel. The induction coil corresponds to the magnetic element, and theinduction coil is disposed on the stator. When a current is applied tothe induction coil, the induction coil acts with the magnetic element togenerate an electromagnetic force to drive the eccentric wheel to rotatearound the rotating shaft, so that the vibration device generates avibration. The rotating shaft is disposed on the stator.

In some embodiments, a slot is formed on the eccentric wheel, and the atleast one magnetic element is disposed in the slot.

In some embodiments, the magnetic element is a multipole magnet.

In some embodiments, a magnetic pole direction of the magnetic elementis substantially parallel to a direction of the rotating shaft.

In some embodiments, the stator includes a disk-shaped structure, andthe induction coil corresponds to the magnetic element, wherein theinduction coil is disposed on an upper surface of the stator, and theupper surface faces the eccentric wheel.

In some embodiments, a magnetic pole direction of the magnetic elementis substantially radially perpendicular to a direction of the rotatingshaft.

In some embodiments, the stator includes a ring structure, the inductioncoil corresponds to the magnetic element, and the induction coil isdisposed on an inner surface of the stator.

In some embodiments, the stator includes a frame structure, the framestructure includes an inner surface, and the induction coil is disposedon the inner surface of a corner of the stator and faces the eccentricwheel.

In some embodiments, the stator includes frame structure, the framestructure includes an inner surface, and the induction coil is disposedon the inner surface of a side of the stator and faces the eccentricwheel.

In some embodiments, the stator includes a frame structure, the framestructure includes an inner surface, and the induction coil is disposedon the inner surface of a side of the stator and faces the eccentricwheel.

In some embodiments, the vibration device further includes a sensingelement, disposed on the inner surface.

According to another embodiment of the disclosure, an vibration deviceincludes a fixed portion and a first vibration device. The firstvibration module is disposed in the fixed portion and includes a firstmovable member, a first resilient element, a first magnetic element anda first induction coil. The first resilient element is connected betweenthe fixed portion and the first movable member. The first induction coilcorresponds to the first magnetic element, wherein the first inductioncoil acts with the first magnetic element to generate an electromagneticforce to drive the first movable member to move along a first axialdirection.

In some embodiments, the vibration device further includes a circuitboard disposed on the fixed portion, and the first induction coil isdisposed inside the circuit board.

In some embodiments, the vibration device further includes an insulationlayer and a conductive layer, and the fixed portion includes a metalmember. The insulation layer is disposed between the conductive layerand the metal member.

In some embodiments, the vibration device includes a plurality of firstinduction coils disposed on the fixed portion, and a minimum distanceand a maximum distance are formed between two adjacent first inductioncoils. The width of the first magnetic element along the first axialdirection is greater than the minimum distance and is less than themaximum distance.

In some embodiments, the vibration device further includes a gel. Thegel is disposed between the first movable member and the first resilientelement, between the fixed portion and the first resilient element, orbetween the first magnetic element and the fixed portion.

In some embodiments, the first movable member is suspended in the fixedportion by the first resilient element.

In some embodiments, the vibration device further includes another firstresilient element, the two first resilient elements are connected toopposite sides of the first movable member, and the two first resilientelements are disposed in opposite directions.

In some embodiments, the vibration device further includes a secondvibration module disposed inside the fixed portion, and the secondvibration module includes a second movable member, a second magneticelement, and a second induction coil. The second induction coilcorresponds to the second magnetic element, and the second inductioncoil acts with the second magnetic element to generate anelectromagnetic force to drive the second movable member to move along asecond axial direction. The first axial direction is not parallel to thesecond axial direction.

In some embodiments, a first opening is formed on the first movablemember, and the second movable member is disposed in the first opening.

In some embodiments, the first movable member and the second movablemember are arranged in a third axial direction, and the third axialdirection is substantially perpendicular to the first axial direction orthe second axial direction.

In some embodiments, a second opening is formed on the second movablemember, and the vibration device further includes a third vibrationmodule disposed in the second opening.

In some embodiments, the third vibration module further includes a thirdmovable member and a third resilient element, and the third resilientelement is disposed between the third movable member and the fixedportion.

In some embodiments, the third vibration module further includes a thirdmagnetic element and third induction coil, and the third induction coilcorresponds to the third magnetic element. The third induction coil actswith the third magnetic element to generate an electromagnetic force todrive the third movable member to move along the third axial direction.

In conclusion, the present disclosure provides a vibration device thatincludes a stator, an eccentric wheel, and an electromagnetic drivingassembly. Because the eccentric wheel and the electromagnetic drivingassembly are disposed in the stator and on the same plane, the thicknessof the vibration device can be decreased so as to achieve the purpose ofminiaturization. In some embodiments, the present disclosure furtherprovides a vibration device which can generate a vibration in singledirection, generate vibrations in two directions generated independentlyor simultaneously, and generate vibrations in three directions, so thatwhen the vibration device of the disclosure is installed in anelectronic device (such as a smartphone or a tablet computer), a usercan be notified of different messages by the different vibrations.

Additional features and advantages of the disclosure will be set forthin the description which follows, and, in part, will be obvious from thedescription, or can be learned by practice of the principles disclosedherein. The features and advantages of the disclosure can be realizedand obtained by means of the instruments and combinations particularlypointed out in the appended claims. These and other features of thedisclosure will become more fully apparent from the followingdescription and appended claims, or can be learned by the practice ofthe principles set forth herein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a vibration device according to anembodiment of the disclosure.

FIG. 2 is an exploded diagram of the vibration device in FIG. 1.

FIG. 3 is a top view of the vibration device in FIG. 1 after removingthe upper fixed member.

FIG. 4 is a diagram of a vibration device according to anotherembodiment of the disclosure.

FIG. 5 is an exploded diagram of the vibration device according toanother embodiment of the disclosure.

FIG. 6 is a top view of a vibration device according to anotherembodiment of the disclosure.

FIG. 7 is a top view of a vibration device according to anotherembodiment of the disclosure.

FIG. 8 is an exploded diagram of a vibration device according to anotherembodiment of the disclosure.

FIG. 9 is a top view illustrating that a first vibration module isdisposed on a fixed portion according to another embodiment of thedisclosure.

FIG. 10 is a sectional view of the first magnetic element and the firstinduction coil along the line A-A′.

FIG. 11 is a diagram of the fixed portion and a circuit board accordingto another embodiment of the disclosure.

FIG. 12 is a structural diagram of a fixed portion according to anotherembodiment of the disclosure.

FIG. 13 is a diagram of a vibration device according to anotherembodiment of the disclosure.

FIG. 14 is an exploded diagram of the vibration device in FIG. 13.

FIG. 15 is a diagram of a vibration device according to anotherembodiment of the disclosure.

FIG. 16 is an exploded diagram of the vibration device in FIG. 15.

FIG. 17 is a diagram of a vibration device according to anotherembodiment of the disclosure.

FIG. 18 is an exploded diagram of the vibration device in FIG. 17.

FIG. 19 is a perspective cross-sectional view of the vibration devicealong the line B-B′ in FIG. 17.

FIG. 20 is a diagram of a vibration device according to anotherembodiment of the disclosure.

FIG. 21 is a sectional view along the line C-C′ in FIG. 20.

DETAILED DESCRIPTION OF THE ILLUSTRATIVE Embodiments

In the following detailed description, for the purposes of explanation,numerous specific details and embodiments are set forth in order toprovide a thorough understanding of the present disclosure. The specificelements and configurations described in the following detaileddescription are set forth in order to clearly describe the presentdisclosure. It will be apparent, however, that the exemplary embodimentsset forth herein are used merely for the purpose of illustration, andthe inventive concept may be embodied in various forms without beinglimited to those exemplary embodiments. In addition, the drawings ofdifferent embodiments may use like and/or corresponding numerals todenote like and/or corresponding elements in order to clearly describethe present disclosure. However, the use of like and/or correspondingnumerals in the drawings of different embodiments does not suggest anycorrelation between different embodiments. The directional terms, suchas “up”, “down”, “left”, “right”, “front” or “rear”, are referencedirections for accompanying drawings. Therefore, using the directionalterms is for description instead of limiting the disclosure.

In this specification, relative expressions are used. For example,“lower”, “bottom”, “higher” or “top” are used to describe the positionof one element relative to another. It should be appreciated that if adevice is flipped upside down, an element at a “lower” side will becomean element at a “higher” side.

The terms “about” and “substantially” typically mean +/−20% of thestated value, more typically +/−10% of the stated value and even moretypically +/−5% of the stated value. The stated value of the presentdisclosure is an approximate value. When there is no specificdescription, the stated value includes the meaning of “about” or“substantially”.

Please refer to FIG. 1 and FIG. 2. FIG. 1 is a schematic diagram of avibration device 100 according to an embodiment of the disclosure, andFIG. 2 is an exploded diagram of the vibration device 100 in FIG. 1according to the embodiment of the disclosure. As shown in FIG. 1 andFIG. 2, the vibration device 100 includes a upper fixed member 102, aplurality of upper induction coils, at least one magnetic element, aneccentric wheel 106, a plurality of lower induction coils, a rotatingshaft 110 and lower fixed member 112. In this embodiment, the upperfixed member 102 and the lower fixed member 112 can be defined as astator of the vibration device 100. The upper fixed member 102 and thelower fixed member 112 respectively include an upper opening 1021 and alower opening 1121. The eccentric wheel 106 includes a central opening1061, and the rotating shaft 110 is disposed through the central opening1061, the upper opening 1021 and the lower opening 1121 and is disposedon the upper fixed member 102 and the lower fixed member 112 through abearing structure (not shown in the figures). As a result, the eccentricwheel 106 can be driven by the rotating shaft 110 to rotate around theZ-axis relative to the upper fixed member 102 and the lower fixed member112.

In this embodiment, the upper induction coils, the lower induction coilsand at least one magnetic element can be defined as an electromagneticdriving assembly of the vibration device 100. The vibration device 100further includes a first magnetic element 114 and a second magneticelement 116, and the eccentric wheel 106 further includes a first slot1062, a second slot 1063, a protruding portion 1064, a protrudingportion 1065 and a protruding portion 1066. The first slot 1062 isformed between the protruding portion 1064 and the protruding portion1065, and the second slot 1063 is formed between the protruding portion1065 and the protruding portion 1066. The first slot 1062 and the secondslot 1063 are for accommodating the second magnetic element 116 and thefirst magnetic element 114, respectively. In this embodiment, when thefirst magnetic element 114 and the second magnetic element 116 aredisposed on the eccentric wheel 106, the magnetic pole directions of thefirst magnetic element 114 and the second magnetic element 116 areparallel to the direction of the rotating shaft 110 (i.e. parallel tothe Z-axis). The North pole of the first magnetic element 114 and theSouth pole of the second magnetic element 116 face the upper fixedmember 102, and the South pole of the first magnetic element 114 and theNorth pole of the second magnetic element 116 face the lower fixedmember 112. In some embodiments, the first magnetic element 114 and thesecond magnetic element 116 can be multipole magnets. In addition, itshould be noted that the protruding portion 1064, the protruding portion1065 and the protruding portion 1066, the first magnetic element 114 andthe second magnetic element 116 can constitute a fan-shaped structure.

As shown in FIG. 2, the upper fixed member 102 and the lower fixedmember 112 respectively have a disk-shaped structure. The upper fixedmember 102 includes a lower surface 1022, and six protruding portions1023 are formed on the lower surface 1022. The lower fixed member 112includes an upper surface 1122, and six protruding portions 1123corresponding to the six protruding portions 1023 are formed on theupper surface 1122. The lower surface 1022 and the upper surface 1122face the eccentric wheel 106. In this embodiment, the vibration device100 includes six upper induction coils 1041˜1046 and six lower inductioncoils 1081˜1086. The upper induction coils 1041˜1046 are respectivelydisposed on the protruding portions 1023, and the lower induction coils1081˜1086 are respectively disposed on the protruding portions 1123 onthe upper surface 1122. In this embodiment, the upper induction coils1041˜1046 and the lower induction coils 1081˜1086 are disposedcorresponding to the first magnetic element 114 and the second magneticelement 116.

Please refer to FIG. 2 and FIG. 3. FIG. 3 is a top view of the vibrationdevice 100 in FIG. 1 after removing the upper fixed member 102 accordingto the embodiment of the disclosure. As shown in FIG. 3, an initialposition of the first magnetic element 114 can be between the upperinduction coil 1042 and upper induction coil 1043, and an initialposition of the second magnetic element 116 can be between upperinduction coil 1041 and the upper induction coil 1042. When a current isapplied to the upper induction coils 1041˜1046 and the lower inductioncoils 1081˜1086 (the lower induction coils 1081˜1086 are not shown inFIG. 3 due to the angle of view), the upper induction coils 1041˜1046and the lower induction coils 1081˜1086 respectively act with the firstmagnetic element 114 and the second magnetic element 116 to generate theelectromagnetic force, so as to drive the eccentric wheel 106 to rotatearound the rotating shaft 110. In particular, as the example in FIG. 2and FIG. 3, the upper induction coil 1041 and the lower induction coil1081 are respectively act with the second magnetic element 116 togenerate an magnetic rejection force, the upper induction coil 1042 andthe lower induction coil 1082 respectively act with the second magneticelement 116 to generate a magnetic attraction force, and the upperinduction coil 1043 and the lower induction coil 1083 respectively actwith the first magnetic element 114 to generate a magnetic rejectionforce, so as to drive the first magnetic element 114, the secondmagnetic element 116 and the eccentric wheel 106 to rotatecounterclockwise around the Z-axis. It should be noted that the currentapplied to the upper induction coils 1041˜1046 and the lower inductioncoils 1081˜1086 can be a direct current or an alternating current, andthe phase of each current which is applied to the upper induction coils1041˜1046 and the lower induction coils 1081˜1086 can be the same ordifferent.

Because the center of gravity of the first magnetic element 114, thesecond magnetic element 116 and the eccentric wheel 106 is deviated fromthe rotating shaft 110 to the fan-shaped structure and is not on therotating shaft 110, when the first magnetic element 114, the secondmagnetic element 116 and the eccentric wheel 106 rotate around therotating shaft 110, the rotation of the first magnetic element 114, thesecond magnetic element 116 and the eccentric wheel 106 causes thevibration device 100 to generate a vibration along the XY plane. Inaddition, the vibration device 100 can further include a position sensor118 (sensing element), configured to sense the position of the eccentricwheel 106 when rotating. As shown in FIG. 2, the vibration device 100includes three position sensors 118, which are disposed on the lowerfixed member 112 and located between two protruding portions 1123.

It should be noted that the eccentric wheel 106 served as a rotor of thevibration device 100 is disposed between the upper fixed member 102 andthe lower fixed member 112, so that this design can decrease thethickness of the vibration device 100 along the Z-axis, so as to achievethe purpose of miniaturization.

Please refer to FIG. 4 and FIG. 5. FIG. 4 is a diagram of a vibrationdevice 200 according to another embodiment of the disclosure. FIG. 5 isan exploded diagram of the vibration device 200 according to anotherembodiment of the disclosure. In this embodiment, the vibration device200 includes a stator 202, a plurality of induction coils 204, aneccentric wheel 206, a rotating shaft 208, a third magnetic element 210and a fourth magnetic element 212. In this embodiment, the stator 202has a ring structure, an inner surface 2021 and a plurality ofprotruding portion 2023 formed on the inner surface 2021. The inductioncoils 204 correspond to the third magnetic element 210 and the fourthmagnetic element 212, and the induction coils 204 are disposed on theprotruding portion 2023 of the inner surface 2021.

Similar to the previous embodiment, the third magnetic element 210 andthe fourth magnetic element 212 can be installed in a first slot 2061and a second slot 2062 of the eccentric wheel 206, and the eccentricwheel 206 can rotate around the rotating shaft 208. It should be notedthat the magnetic pole directions of the third magnetic element 210 andthe fourth magnetic element 212 are radially perpendicular to thedirection of the rotating shaft 208 (the direction along the Z-axis), asshown in FIG. 4. More specifically, the North pole of the third magneticelement 210 faces the stator 202 and the South pole of the thirdmagnetic element 210 faces the rotating shaft 208. Comparatively, theSouth pole of the fourth magnetic element 212 faces the stator 202, andthe North pole of the fourth magnetic element 212 faces the rotatingshaft 208. When the induction coils 204 are supplied with electricity,the induction coils 204 respectively acts with the third magneticelement 210 and the fourth magnetic element 212 to generate theelectromagnetic force, so as to drive the third magnetic element 210,the fourth magnetic element 212 and the eccentric wheel 206 to rotatearound the rotating shaft 208. Because the center of gravity of thethird magnetic element 210, the fourth magnetic element 212 and theeccentric wheel 206 is deviated from the rotating shaft 208, when theeccentric wheel 206 rotates, the rotation causes the vibration device200 to generate a vibration along the XY plane.

In addition, the vibration device 200 can include at least one sensingelement 214. As shown in FIG. 5, the vibration device 200 includes threesensing elements 214, disposed on an upper surface 2025 of the stator202, but the position and the number of the sensing element 214 are notlimited thereto. For example, the sensing element 214 can also bedisposed between two protruding portions 2023 on the inner surface 2021.It should be noted that the induction coils 204, the eccentric wheel206, the third magnetic element 210 and the fourth magnetic element 212are all located on the same plane (the XY plane), so that the thicknessof the vibration device 200 along the Z-axis in this embodiment can bedecreased further, so as to achieve the purpose of miniaturization.

Please refer to FIG. 6, which is a top view of a vibration device 300according to another embodiment of the disclosure. The vibration device300 in this embodiment is similar to the vibration device 200 in FIG. 4,and the difference between these two vibration devices is that a stator302 of the vibration device 300 in this embodiment has a framestructure. As shown in FIG. 6, the stator 302 includes an inner surface3021, and four first protruding portions 3023 are formed on the innersurface 3021 and located at four corners of the stator 302.

In addition, the vibration device 300 can include the eccentric wheel206, the rotating shaft 208, the third magnetic element 210, the fourthmagnetic element 212 and four induction coils 304. The induction coils304 are respectively disposed on the first protruding portions 3023 andface the eccentric wheel 206. Similarly, the North pole of the thirdmagnetic element 210 faces the stator 202 and the South pole of thethird magnetic element 210 faces the rotating shaft 208, and the Southpole of the fourth magnetic element 212 faces the stator 202 and theNorth pole of the fourth magnetic element 212 faces the rotating shaft208. When the induction coils 304 are supplied with electricity, theinduction coils 304 respectively acts with the third magnetic element210 and the fourth magnetic element 212 to generate the electromagneticforce, so as to drive the third magnetic element 210, the fourthmagnetic element 212 and the eccentric wheel 206 to rotate around therotating shaft 208. Because the center of gravity of the third magneticelement 210, the fourth magnetic element 212 and the eccentric wheel 206is deviated from the rotating shaft 208, when the eccentric wheel 206rotates, the rotation causes the vibration device 300 to generate avibration along the XY plane.

Furthermore, as shown in FIG. 6, there can be four second protrudingportions 3025 formed on the inner surface 3021 of the stator 302, andthe four second protruding portions 3025 are located on four sides ofthe stator 302. The vibration device 300 can include at least onesensing element 306 for sensing the position of the eccentric wheel 206when rotating. In this embodiment, the vibration device 300 includesthree sensing elements 306, respectively disposed on three secondprotruding portions 3025, and each of the sensing elements 306 islocated between two adjacent induction coils 304. It is noted that thesensing element 306 can also be disposed on the inner surface 3021 inother embodiments.

Because the electromagnetic driving assembly and the eccentric wheel 206are positioned on the same plane (the XY plane), the thickness of thevibration device 300 along the Z-axis can also be decreased.

Please refer to FIG. 7, which is a top view of a vibration device 300Aaccording to another embodiment of the disclosure. The vibration device300A is similar to the vibration device 300 in the previous embodiment,and the difference between these two vibration devices is that the fourinduction coils 304 are respectively disposed on the second protrudingportions 3025 of the four sides and face the eccentric wheel 206, andthe three sensing elements 306 are disposed on the three firstprotruding portions 3023 in this embodiment. The positions of theinduction coils 304 and the sensing elements 306 depend on practicaldesign requirements. For example, the sensing element 306 can also bedisposed on the inner surface 3021. The driving mechanism of thevibration device 300A is similar to that of the previous embodiment, andthe description is therefore omitted herein.

Please refer to FIG. 8 and FIG. 9. FIG. 8 is an exploded diagram of avibration device 400 according to another embodiment of the disclosure,and FIG. 9 is a top view of FIG. 8 illustrating that a first vibrationmodule 404 is disposed on a fixed portion 402. As shown in FIG. 8, thevibration device 400 includes a cover 401, the fixed portion 402 and thefirst vibration module 404. The first vibration module 404 is disposedinside the fixed portion 402, and the cover 401 is fixed to the fixedportion 402. The first vibration module 404 can include a first movablemember 406, at least one first resilient element 408, at least one firstmagnetic element 410 and at least one first induction coil 412. In thisembodiment, the first vibration module 404 can include two firstresilient elements 408, five first magnetic elements 410 and eight firstinduction coils 412.

As shown in FIG. 8 and FIG. 9, the first movable member 406 has arectangular structure, and a plurality of installing slots 4061corresponding to the first magnetic elements 410 are formed on the firstmovable member 406 for accommodating the first magnetic elements 410.The North poles of the first, third and fifth first magnetic elements410 extend toward the −Z-axis, and the North poles of the second andfourth first magnetic elements 410 extend toward the Z-axis. The twofirst resilient element 408 are arranged along the Y-axis and arelocated two opposite sides of the first movable member 406, and thefirst resilient elements 408 are configured to connect the first movablemember 406 to the fixed portion 402. It should be noted that the firstmovable member 406 are suspended in the fixed portion 402 by the twofirst resilient elements 408, and the first movable member 406 is not incontact with the fixed portion 402. In addition, as shown in FIG. 9, thetwo first resilient elements 408 are connected to two opposite sides ofthe first movable member 406, and the two first resilient elements 408are disposed in different directions. That is, the fixed portion 402 candefine a central line CL perpendicular to the Y-axis (first axialdirection), and the two first resilient elements 408 are rotationalsymmetry relative to the central line CL.

As shown in FIG. 8, the four first induction coils 412 are disposedabove the first movable member 406 and are securely disposed on thecover 401. The other four first induction coils 412 are disposed belowthe first movable member 406 and are securely disposed inside the fixedportion 402.

As shown in FIG. 9, the first magnetic elements 410 and the firstinduction coils 412 are disposed in a staggered manner. When the firstinduction coils 412 are supplied with electricity, the first inductioncoils 412 act with the first magnetic elements 410 to generate theelectromagnetic force, so as to drive the first movable member 406 tomove along the Y-axis (the first axis direction). Because the firstinduction coils 412 receive the alternating current, the direction ofthe electromagnetic force continuously changes, so that the firstmovable member 406 repeatedly moves rightward and leftward in the fixedportion 402 along the Y-axis, causing a vibration of the vibrationdevice 400 along the Y-axis.

In addition, the vibration device 400 can further include two weightblocks 414 and a plurality of gels 416, configured to adjust a resonantfrequency when the vibration device 400 vibrates. In this embodiment,the two weight blocks 414 are symmetrically disposed on two oppositesides of the first movable member 406. As shown in FIG. 9, the gel 416can be disposed between the first movable member 406 and the firstresilient element 408 or disposed between the fixed portion 402 and thefirst movable member 406. The gel 416 is not only configured to adjustthe resonant frequency of the vibration device 400, but also has acushion function. For achieve the effect of cushion, the gel 416 canalso be disposed between a bottom portion 4081 of the first resilientelement 408, or disposed between the first magnetic element 410 and thefixed portion 402. Positions of the gels 416 are not limited to thepresent disclosure.

Furthermore, the vibration device 400 can also include at least onesensing element 418, disposed on the first movable member 406, and thesensing element 418 is configured to sense a position of the firstmovable member 406 relative to the fixed portion 402. Specifically, inthis embodiment, the sensing element 418 is disposed between two firstmagnetic elements 410 (as shown in FIG. 8). Based on the structuraldesign of this embodiment, the vibration device 400 can provides avibration in the Y-axis, and the thickness of the vibration device 400along the Z-axis can also be decreased.

Please refer to FIG. 10, which is a sectional view of the first magneticelement 410 and the first induction coil 412 along the line A-A′ in FIG.9 according to the embodiment of the disclosure. For convenience ofdescription, only one first magnetic element 410 and two adjacent firstinduction coils 412 are shown in FIG. 10. The first magnetic element 410has a width c along the Y-axis (the first axial direction), and aminimum distance a and a maximum distance b are formed between the twofirst induction coils 412. The first magnetic element 410 is disposedbetween the two adjacent first induction coils 412, and the width c ofthe first magnetic element 410 is greater than the minimum distance aand is less than the maximum distance b.

Please refer to FIG. 11, which is a diagram of the fixed portion 402 anda circuit board 420 according to another embodiment of the disclosure.In this embodiment, the vibration device (such as the vibration device400 in FIG. 8) can further include the circuit board 420, disposed onthe fixed portion 402, and the first induction coils 412 can be disposedinside the circuit board 420 (the circuit board 420 and the firstinduction coils 412 can constitute a plate coil). Because there can befewer turns of the plate coil, the thickness of the plate coil can besmaller, and the thickness of the vibration device (such as thevibration device 400 in FIG. 8) along the Z-axis can be decreasedfurther.

Please refer to FIG. 12, which is a structural diagram of a fixedportion 402A according to another embodiment of the disclosure. In thisembodiment, the fixed portion 402A can be a metal member, and thevibration device (such as the vibration device 400 in FIG. 8) canfurther include an insulation layer 422 and a plurality of conductivelayers 424. The insulation layer 422 is disposed between the conductivelayers 424 and the fixed portion 402A. It should be noted that theconductive layers 424 can constitute an induction coil (such as thefirst induction coil 412), and the induction coil which is constitutedby the conductive layers 424 has a smaller thickness along the Z-axis,so that the thickness of the vibration device along the Z-axis can bedecreased further.

Please refer to FIG. 13 and FIG. 14. FIG. 13 is a diagram of a vibrationdevice 500 according to another embodiment of the disclosure, and FIG.14 is an exploded diagram of the vibration device 500 in FIG. 13. Asshown in FIG. 13, the vibration device 500 includes a fixed portion 502,a first vibration module 504 and a second vibration module 506. In thisembodiment, the fixed portion 502 includes a separating plate 5021, andthe first vibration module 504 and the second vibration module 506 aredisposed inside the fixed portion 502 and are located on two sides ofthe separating plate 5021. In this embodiment, the first vibrationmodule 504 is configured to generate a vibration along the Y-axis (thefirst axial direction), and the second vibration module 506 isconfigured to generate a vibration along the X-axis (a second axialdirection). The first axial direction is not parallel to the secondaxial direction. For example, the first axial direction can besubstantially perpendicular to the second axial direction.

As shown in FIG. 14, the first vibration module 504 includes a firstmovable member 508, three first magnetic elements 510, four firstinduction coils 512 and two first resilient elements 514. In thisembodiment, the three first magnetic elements 510 are disposed in thefirst movable member 508, and the four first induction coils 512corresponding to the first magnetic elements 510 are disposed on twosides of the first movable member 508 along the Z-axis. Two firstinduction coils 512 are securely disposed in the fixed portion 502, andthe other two first induction coils 512 are securely disposed on a coverof the fixed portion 502 (the cover is not shown in the figures). Thetwo first resilient elements 514 are respectively disposed on two sidesof the first movable member 508 along the Y-axis, so as to suspend thefirst movable member 508 in the fixed portion 502.

In addition, the second vibration module 506 includes a second movablemember 516, three second magnetic elements 518, four second inductioncoils 520 and two second resilient elements 522. In this embodiment, thethree second magnetic elements 518 are disposed in the second movablemember 516, and the four second induction coils 520 corresponding to thesecond magnetic elements 518 are disposed on two sides of the secondmovable member 516 along the Z-axis. Two second induction coils 520 aresecurely disposed in the fixed portion 502, and the other two secondinduction coils 520 are securely disposed on the cover (the cover is notshown in the figures). The two second resilient elements 522 arerespectively disposed on two sides of the second movable member 516along the Y-axis, and the second resilient elements 522 are configuredto suspend the second movable member 516 in the fixed portion 502.

Similar to the previous embodiment, when the first induction coils 512are supplied with electricity, the first induction coils 512 act withthe first magnetic elements 510 to generate the electromagnetic force,so as to drive the first movable member 508 to move along the Y-axis, sothat the vibration device 500 generates a vibration along the Y-axis.When the second induction coils 520 are supplied with electricity, thesecond induction coils 520 act with the second magnetic elements 518 togenerate the electromagnetic force, so as to drive the second movablemember 516 to move along the X-axis, so that the vibration device 500generates a vibration along the X-axis. It should be noted that thefirst vibration module 504 and the second vibration module 506 cangenerate the vibrations at the same time, or can separately generate thevibrations.

Furthermore, the vibration device 500 can further include at least onesensing element 524, disposed on the first movable member 508 or on thesecond movable member 516, and the sensing element 524 is configured tosense the movement of the first movable member 508 or the second movablemember 516. In this embodiment, the vibration device 500 includes twosensing elements 524, respectively disposed on the first movable member508 and the second movable member 516.

Based on the design of the first vibration module 504 and the secondvibration module 506 in this embodiment, the vibration device 500 canprovides vibrations in two directions. In addition, in anotherembodiment, the separating plate 5021 in FIG. 14 can be omitted in thefixed portion 502, and the first resilient element 514 between the firstmovable member 508 and the second movable member 516 can be directlyconnected to the second movable member 516.

Next, please refer to FIG. 15 and FIG. 16. FIG. 15 is a diagram of avibration device 600 according to another embodiment of the disclosure.FIG. 16 is an exploded diagram of the vibration device 600 in FIG. 15.As shown in FIG. 15, the vibration device 600 includes a fixed portion602, a first vibration module 604 and a second vibration module 606. Inthis embodiment, the first vibration module 604 and the second vibrationmodule 606 are disposed inside the fixed portion 602. In thisembodiment, the first vibration module 604 is configured to generate avibration along the Y-axis (the first axial direction), and the secondvibration module 606 is configured to generate a vibration along theX-axis (the second axial direction). The first axial direction is notparallel to the second axial direction.

As shown in FIG. 16, the first vibration module 604 includes a firstmovable member 608, six first magnetic elements 610, eight firstinduction coils 612 and two first resilient elements 614. In thisembodiment, three first magnetic elements 610 are disposed on one sideof the first movable member 608, and the other three first magneticelements 610 are disposed on the other side of the first movable member608. The eight first induction coils 612 corresponding to the firstmagnetic elements 610 are disposed on two sides of the first movablemember 608 along the Z-axis. Four first induction coils 612 are securelydisposed in the fixed portion 602, and the other four first inductioncoils 612 are securely disposed on a cover of the fixed portion 602 (thecover is not shown in the figures). The two first resilient elements 614are respectively disposed on two sides of the first movable member 608along the Y-axis, so as to suspend the first movable member 608 in thefixed portion 602. It should be noted that a first opening 6081 isformed on a central position of the first movable member 608, and thefirst opening 6081 is configured to accommodate the second vibrationmodule 606.

In this embodiment, the second vibration module 606 includes a secondmovable member 616, two second magnetic elements 618, two secondinduction coils 620 and two second resilient elements 622. In thisembodiment, two second magnetic elements 618 are disposed in the secondmovable member 616, and the two second induction coils 620 correspondingto the second magnetic elements 618 are disposed on two sides of thesecond movable member 616 along the Z-axis. One second induction coil620 is securely disposed in the fixed portion 602, and the other onesecond induction coil 620 is securely disposed on the cover (the coveris not shown in the figures). It should be noted that the two secondresilient elements 622 are respectively disposed on two sides of thesecond movable member 616 along the X-axis, and the second resilientelements 622 are configured to suspend the second movable member 616 inthe first opening 6081 of the first movable member 608.

When the first induction coils 612 are supplied with electricity, thefirst induction coils 612 act with the first magnetic elements 610 togenerate the electromagnetic force, so as to drive the first movablemember 608 to move along the Y-axis, so that the vibration device 600generates a vibration along the Y-axis. When the second induction coils620 are supplied with electricity, the second induction coils 620 actwith the second magnetic elements 618 to generate the electromagneticforce, so as to drive the second movable member 616 to move along theX-axis, so that the vibration device 600 generates a vibration along theX-axis. Similarly, the first vibration module 604 and the secondvibration module 606 can generate the vibrations at the same time, orcan separately generate the vibrations.

Furthermore, the vibration device 600 can further include at least onesensing element 624, disposed on the first movable member 608 or on thesecond movable member 616, and the sensing element 624 is configured tosense the movement of the first movable member 608 or the second movablemember 616. In this embodiment, the vibration device 600 includes onesensing element 624, disposed on the first movable member 608 andlocated between two adjacent first magnetic elements 610.

The vibration device 600 in this embodiment provides the vibrations intwo directions, and the second vibration module 606 is disposed in thefirst opening 6081 of the first movable member 608, so that the lengthof the vibration device 600 along the Y-axis can be further decreased,so as to achieve the purpose of miniaturization.

Please refer to FIG. 17 and FIG. 18. FIG. 17 is a diagram of a vibrationdevice 700 according to another embodiment of the disclosure. FIG. 18 isan exploded diagram of the vibration device 700 in FIG. 17. As shown inFIG. 17, the vibration device 700 includes a fixed portion 702, a firstvibration module 704, a second vibration module 706 and a thirdvibration module 707. In this embodiment, the first vibration module 704is configured to generate a vibration along the Y-axis (the first axialdirection), the second vibration module 706 is configured to generate avibration along the X-axis (the second axial direction), and the thirdvibration module 707 is configured to generate a vibration along theZ-axis (the third axial direction).

As shown in FIG. 18, the first vibration module 704 includes a firstmovable member 708, four first magnetic elements 710, four firstinduction coils 712 and two first resilient elements 714. In thisembodiment, four first magnetic elements 710 are disposed in the firstmovable member 708, and the four first induction coils 712 correspondingto the first magnetic elements 710 are disposed on two sides of thefirst movable member 708 along the Z-axis. Two first induction coils 712are securely disposed in the fixed portion 702, and the other two firstinduction coils 712 are securely disposed on a cover of the fixedportion 702 (the cover is not shown in the figures). The two firstresilient elements 714 are respectively disposed on two sides of thefirst movable member 708 along the Y-axis, so as to suspend the firstmovable member 708 in the fixed portion 702.

In addition, the second vibration module 706 includes a second movablemember 716, four second magnetic elements 718, four second inductioncoils 720 and two second resilient elements 722. In this embodiment, thefour second magnetic elements 718 are disposed in the second movablemember 716, and the four second induction coils 720 corresponding to thesecond magnetic elements 718 are disposed on two sides of the secondmovable member 716 along the Z-axis. Two second induction coils 720 aresecurely disposed in the fixed portion 702, and the other two secondinduction coils 720 are securely disposed on the cover (the cover is notshown in the figures). The two second resilient elements 722 arerespectively disposed on two sides of the second movable member 716along the X-axis, and the second resilient elements 722 are configuredto suspend the second movable member 716 in the fixed portion 702.

It should be noted that the first movable member 708 includes a firstslot 7081, and the second movable member 716 includes a second slot7161. The first slot 7081 is configured to face the second slot 7161 andis substantially align with the second slot 7161, and the first movablemember 708 and the second movable member 716 are arranged along theZ-axis (the third axial direction). In this embodiment, the third axialdirection can be perpendicular to the first axial direction or thesecond axial direction. In addition, the first movable member 708further includes a first opening 7082, the second movable member 716further includes a second opening 7162, and the third vibration module707 can be disposed in the first opening 7082 and the second opening7162.

Please refer to FIG. 18 and FIG. 19. FIG. 19 is a perspectivecross-sectional view of the vibration device 700 along the line B-B′ inFIG. 17 according to the embodiment of the disclosure. As shown in FIG.18, the third vibration module 707 includes a third movable member 724,a third magnetic element 726, a third induction coil 728 and two thirdresilient elements 730. In this embodiment, the third movable member 724includes a bottom portion 7241 and a protruding portion 7242, the thirdinduction coil 728 is fixed to the cover (not shown in the figures), andthe third induction coil 728 has a ring structure which surrounds theprotruding portion 7242 and is not in contact with the protrudingportion 7242. The third magnetic element 726 has a ring structure whichsurrounds the third induction coil 728, and the third magnetic element726 is securely disposed on the third movable member 724. One of thethird resilient elements 730 (such as the lower third resilient elements730 in FIG. 18) is disposed between the fixed portion 702 and the thirdmovable member 724, and is configured to connect the fixed portion 702with the bottom portion 7241 of the third movable member 724. Morespecifically, an inner ring portion of the third resilient elements 730is connected to the bottom portion 7241 of the third movable member 724,and an outer ring portion of the third resilient elements 730 isconnected to the fixed portion 702. Furthermore, the other thirdresilient elements 730 (such as the upper third resilient elements 730in FIG. 18) is disposed between the cover (not shown in the figures) andthe third magnetic element 726. The third magnetic element 726 isconnected to an inner ring portion of the third resilient elements 730,and an outer ring portion of the third resilient elements 730 isconnected to the cover (not shown in the figures). It should be notedthat the first movable member 708 is suspended in the fixed portion 702,and the second movable member 716 is suspended in the fixed portion 702and is not in contact with the first movable member 708 as shown in FIG.19. Moreover, the third movable member 724 is not in contact with thefirst movable member 708 or the second movable member 716.

When the first induction coils 712 are supplied with electricity, thefirst induction coils 712 act with the first magnetic elements 710 togenerate the electromagnetic force, so as to drive the first movablemember 708 to move along the Y-axis, so that the vibration device 700generates a vibration along the Y-axis. When the second induction coils720 are supplied with electricity, the second induction coils 720 actwith the second magnetic elements 718 to generate the electromagneticforce, so as to drive the second movable member 716 to move along theX-axis, so that the vibration device 700 generates a vibration along theX-axis. When the third induction coil 728 is supplied with electricity,the third induction coil 728 acts with the third magnetic element 726 togenerate the electromagnetic force, so that the third magnetic element726 drives the third movable member 724 to move along the Z-axis. As aresult, the vibration device 700 generates a vibration along the Z-axis.The first vibration module 704, the second vibration module 706 and thethird vibration module 707 can generate the vibrations at the same time,or can separately generate the vibrations. In addition, as shown in FIG.18, the vibration device 700 can include three sensing elements 732,respectively disposed on the first movable member 708, the secondmovable member 716 and the third movable member 724. The sensingelements 732 are configured to sense the movement of the first movablemember 708, the second movable member 716 and the third movable member724.

Please refer to FIG. 20 and FIG. 21. FIG. 20 is a diagram of a vibrationdevice 800 according to another embodiment of the disclosure, and FIG.21 is a sectional view along the line C-C′ in FIG. 20. As shown in FIG.20, the vibration device 800 includes a fixed portion 802, a firstvibration module 804 and a second vibration module 806, and the firstvibration module 804 includes a first movable member 808, four firstmagnetic elements 810, four first induction coils 812 and two firstresilient elements 814. Positions and relative relationship of eachelement of the first vibration module 804 is similar to the firstvibration module 604 in FIG. 15, and is omitted herein. Specifically,the first movable member 808 includes an opening 8081, and the secondvibration module 806 is engaged in the opening 8081.

As shown in FIG. 21, the second vibration module 806 includes a base816, a second magnetic element 818, a second induction coil 820 and twosecond resilient elements 822. In this embodiment, the base 816 includesa protruding portion 8161, and the second induction coil 820 sheathes onthe protruding portion 8161. The two second resilient elements 822suspend the second magnetic element 818 in the base 816. The secondmagnetic element 818 has a ring structure and movably surrounds thesecond induction coil 820.

When the first induction coils 812 are supplied with electricity, thefirst induction coils 812 act with the first magnetic elements 810 togenerate the electromagnetic force, so as to drive the first movablemember 808 to move along the Y-axis, so that the vibration device 800generates a vibration along the Y-axis. When the second induction coil820 is supplied with electricity, the second induction coil 820 actswith the second magnetic element 818 to generate the electromagneticforce, so as to drive the second magnetic element 818 to move along theZ-axis, so that the vibration device 800 generates a vibration along theZ-axis. Similarly, the first vibration module 804 and the secondvibration module 806 can generate the vibrations at the same time, orcan separately generate the vibrations. In addition, the vibrationdevice 800 can also include two sensing elements (not shown in thefigures) respectively disposed on the first movable member 808 and thebase 816, and the sensing elements are configured to sense the movementof the first movable member 808 and the base 816.

In conclusion, the present disclosure provides a vibration device thatincludes a stator, an eccentric wheel and an electromagnetic drivingassembly. Because the eccentric wheel and the electromagnetic drivingassembly are disposed in the stator and on the same plane, the thicknessof the vibration device can be decreased, so as to achieve the purposeof miniaturization. In some embodiments, the present disclosure furtherprovides a vibration device which can generate a vibration in singledirection, generate vibrations in two directions generated independentlyor simultaneously, and generate vibrations in three directions, so thatwhen the vibration device of the disclosure is installed in anelectronic device (such as a smartphone or a tablet computer), a usercan be notified of different messages by the different vibrations.

Although the embodiments and their advantages have been described indetail, it should be understood that various changes, substitutions, andalterations can be made herein without departing from the spirit andscope of the embodiments as defined by the appended claims. Moreover,the scope of the present application is not intended to be limited tothe particular embodiments of the process, machine, manufacture,composition of matter, means, methods, and steps described in thespecification. As one of ordinary skill in the art will readilyappreciate from the disclosure, processes, machines, manufacture,compositions of matter, means, methods, or steps, presently existing orlater to be developed, that perform substantially the same function orachieve substantially the same result as the corresponding embodimentsdescribed herein may be utilized according to the disclosure.Accordingly, the appended claims are intended to include within theirscope such processes, machines, manufacture, compositions of matter,means, methods, or steps. In addition, each claim constitutes a separateembodiment, and the combination of various claims and embodiments arewithin the scope of the disclosure.

What is claimed is:
 1. A vibration device, comprising: a fixed portion;and a first vibration module, disposed in the fixed portion, comprising:a first movable member; a first resilient element, connected between thefixed portion and the first movable member; a first magnetic element;and a first induction coil, corresponding to the first magnetic element,wherein the first induction coil acts with the first magnetic element togenerate an electromagnetic force to drive the first movable member tomove along a first axial direction; wherein the vibration device furthercomprises a second vibration module disposed inside the fixed portion,and the second vibration module comprises: a second movable member; asecond magnetic element; and a second induction coil, corresponding tothe second magnetic element, wherein the second induction coil acts withthe second magnetic element to generate an electromagnetic force todrive the second movable member to move along a second axial direction;wherein the first axial direction is not parallel to the second axialdirection.
 2. The vibration device as claimed in claim 1, wherein thevibration device further comprises a circuit board disposed on the fixedportion, and the first induction coil is disposed inside the circuitboard.
 3. The vibration device as claimed in claim 1, wherein thevibration device further comprises an insulation layer and a conductivelayer, and the fixed portion includes a metal member, wherein theinsulation layer is disposed between the conductive layer and the metalmember.
 4. The vibration device as claimed in claim 1, wherein thevibration device comprises a plurality of first induction coils disposedon the fixed portion, and a minimum distance and a maximum distance areformed between two adjacent first induction coils, wherein the width ofthe first magnetic element along the first axial direction is greaterthan the minimum distance and is less than the maximum distance.
 5. Thevibration device as claimed in claim 1, wherein the vibration devicefurther comprises a gel, wherein the gel is disposed between the firstmovable member and the first resilient element, disposed between thefixed portion and the first resilient element, or disposed between thefirst magnetic element and the fixed portion.
 6. The vibration device asclaimed in claim 1, wherein the first movable member is suspended in thefixed portion by the first resilient element.
 7. The vibration device asclaimed in claim 1, wherein the vibration device further comprisesanother first resilient element, the two first resilient elements areconnected to opposite sides of the first movable member, and the twofirst resilient elements are disposed in opposite directions.
 8. Thevibration device as claimed in claim 1, wherein a first opening isformed on the first movable member, and the second movable member isdisposed in the first opening.
 9. The vibration device as claimed inclaim 1, wherein the first movable member and the second movable memberare arranged in a third axial direction, and the third axial directionis substantially perpendicular to the first axial direction or thesecond axial direction.
 10. The vibration device as claimed in claim 1,wherein a second opening is formed on the second movable member, and thevibration device further comprises a third vibration module disposed inthe second opening.
 11. The vibration device as claimed in claim 10,wherein the third vibration module further includes a third movablemember and a third resilient element, and the third resilient element isdisposed between the third movable member and the fixed portion.
 12. Thevibration device as claimed in claim 11, wherein the third vibrationmodule further includes a third magnetic element and a third inductioncoil, and the third induction coil corresponds to the third magneticelement, wherein the third induction coil acts with the third magneticelement to generate an electromagnetic force to drive the third movablemember to move along the third axial direction.